You know J.J. Watt, Richard Sherman and Ndamukong Suh, but what about Everson Griffen and DeAndre Levy? They're among five relatively unknown defensive players having an impressive season. Here's a closer look at each.

USF pass rusher Aaron Lynch was given a life vest by San Francisco 49ers coach Jim Harbaugh. The fifth-round pick received an endorsement from coach Willie Taggart -- longtime Harbaugh friend -- but anything but from Hans Straub, the Bulls' strength coach. Do the 49ers have reason to believe Lynch is salvageable?